—I’m sorry to have kept you ______ for such a long time.—It doesn’t matter.A. wait B. waiting C. to wait
When I was a child, I used to ___________ chocolate.
Did the police catch the thief___________?
He doesn’t do his homework___________, though he has ___________.
—_________ was light bulb invented ________ ? —Thomas Edison.
Some students enjoy raising pet dogs while_ _ don't agree with them.